Cavity and Cryomodule Plug-Compatibility To Reach Consensus Akira Yamamoto ILC-08, Chicago, Nov. 17, 2008 Nov. 17, 2008ILC-08 SCRF1

Why and How Plug-compatibility ? Cavity –Necessary “extended research” to improve field gradient, –Keep “room” to improve field gradient, –Establish common interface conditions, Cryomodule –Nearly ready for “system engineering” –Establish unified interface conditions, –Intend nearly unified engineering design –Need to adapt to each regional feature and industrial constraint 2 Nov. 17, 2008 ILC-08 SCRF

Global Cooperation with Plug-compatible Design and R&Ds 3 Nov. 17, 2008 ILC-08 SCRF

Plug-compatibility in R&D and Construction Phases R&D Phase –Creative work for further improvement with keeping replaceable condition, –Global cooperation and share for intellectual engagement Construction Phase –Keep competition with free market/multiple-suppliers, and effort for const-reduction, (with insurance) –Maintain “intellectual” regional expertise base –Encourage regional centers for fabrication/test facilities with accepting regional features/constraints 4 Nov. 17, 2008 ILC-08 SCRF

How do we discuss the Cavity Plug-compatibility ? Constraint in S1-Global: – S1-Global cryomodule design has already progressed, and in fabrication stage – DESY, Fermilab, KEK cavity design difference has been already absorbed in the S1-global cryomdule design, Discuss “the plug-compatible design” in long- term scope, Nov. 17, 2008ILC-08 SCRF5

6 Cavity and Cryomodule Test with Plug Compatibility Cavity integration and the String Test to be organized with: –2 cavities from EU (DESY) and AMs (Fermilab) –4 cavities from AS (KEK (and IHEP)) –Each half-cryomodule from INFN and KEK Nov. 17, 2008 ILC-08 SCRF

S1-Global: Cryomodule Assembly 7 Plug-compatibility to be examined Seminar at BARC ILC Global Design Effort

Two steps Nov. 17: – Discuss and fix general envelopes – Preliminary discussions on Tuner and Coupler Nov. 18: – Discuss Tuner and Coupler Fix the cavity suspension point/interface Nov. 17, 2008ILC-08 SCRF8

9 Plug-compatible Development Plug-compatible interface to be established Nov. 17, 2008 ILC-08 SCRF

Plug compatible conditions at Cavity package (in progress) ItemCan be flexible Plug- compatibl e Cavity shapeTeSLA/L L/RE LengthRequired Beam pipe diaReuuired FlangeRequired TunerTBD Coupler flangeRequired He –in-line jointRequired Input couplerTBD 10 Nov. 17, 2008 ILC-08 SCRF

Design change of KEK cavity-vessel 2008/11/17 ILC08-GDE-Meeting- Chicago 11 Position of the slide jack tuner –Motor-drive-shaft moves to the opposite side of input coupler. Cavity length (1258.6mm → mm) Flange to flange = mm KEK-old KEK-new Flange to flange = mm 660 mm

Design change of KEK cavity- vessel 2008/11/17 ILC08-GDE-Meeting- Chicago 12 The vacuum bellow was designed to move on the side of Module-A. – Interference between the vacuum bellows and the motor-drive-shaft. – The big vacuum bellows need to be re-designed in order to move to the side of Module-C. For the ILC-module design, the flange for the drive-shaft should be re-designed without interference with the big vacuum bellows. Input coupler Motor driving shaft

Proposal of the design change of FNAL cavity-vessel 2008/11/17 ILC08-GDE-Meeting- Chicago 13 The positions of the support lags between the DESY and the present FNAL cavities have the compatibility. FNAL group proposed the change of the blade tuner position. By this design change, the support legs under the GRP should be re-designed in order to accommodate the FNAL cavities. Present design of the FNAL-cavity vessel Modified design of the FNAL-cavity vessel

Cavity Envelope (1) Nov. 17, 2008ILC-08 SCRF14

Envelope (2) Nov. 17, 2008ILC-08 SCRF15

Specification profile tables update H. Hayano,

Specification Profile Tables The purpose of table: to understand specification of function, specification of physical dimensions, etc. to understand what is fixed, what is not fixed, for item by item. to facilitate ‘Plug compatibility’ concept. Tables visualize the specifications for; Cavity Tuner Coupler We had the discussion at Cavity Kick-off meeting in DESY (Sep. 2007), at ML-SCRF meeting in DESY (Jan. 2008), at GDE meeting in Sendai (Mar. 2008), at ML-SCRF meeting in FNAL (Apr. 2008) Updated tables are followings;

cavity specification itemspecificationunit and commentsfurther comments RF properties Frequency1.30GHz Number of cells9.00cells Gradient 31.50MV/moperational 35.00MV/mVertical test Q ^10at ^10at 31.5 HOM damping Qdecide later R/Qdecide later Short range wake decide later Operating temperature2.00K Physical properties Length1247mmTESLA-short length Aperture mm must be compatible with beam dynamics Alignment accuray300.00umrms MaterialNiobium Wall thickness2.80mm Stiffness decide later Flange/Seal system Materialdecide later Maximum overpressure allowed2bar Lorentz force detuning over Flat- top at 35 MV/m1.00kHzmaximum Outer diameter He vessel mm(inner diameter) Mag shield outside, decide later for precise number mm(inner diameter) KEK Mag shield inside, decide later for precise number Magnetic shielding inside/outsidedecide later * yellow boxes indicate ‘not fixed’

tuner specification itemspecificationunit and commentsfurther comments Slow tuner Tuning range>600kHz Hysteresis in Slow tuning <10µm Motor requirement step-motor use, Power-off Holding, magnetic shielding Motor specification ex) 5 phase, xxA/phase, … match to driver unit, match to connector pin asignment,… decide later Motor location insdie 4K? / outside 300K? / inside 300K accessible from outside? need availability discussion, MTBF decide later Magnetic shielding<20 mG at Cavity surface, average on equater Heat Load by motor<50mW at 2K Physical envelope do not conflict with GRP, 2-phase line, vessel support, alignment references, Invar rod, flange connection,… cable connection, Mag shield Survive Frequency Change in Lifetime of machine ~20 Mio. steps could be total number of steps in 20 years, * yellow boxes indicate ‘not fixed’

Fast tuner Tuning range>1 kHz over flat-top at 2K Lorentz detuning residuals <50 Hz at 31.5MV/m flat- top (LD and microphinics? or LD only?) :decide later Actuator specification ex) low voltage piezo V, … match to driver unit, match to connector pin asignment, … decide later Actuator location insdie 4K?/inside 4K accessible/inside 100K? accesible / inside 300K accessible from outside? decide later Magnetic shielding<20 mG at Cavity surface average Heat Load in operation <50mW Physical envelope do not conflict with GRP, 2-phase line, vessel support, alignment references, Invar rod, flange connection,… Survive Frequency Change in Lifetime of machine >10 10 number of pulses over 20 years, (2x10 9 :operational number) * yellow boxes indicate ‘not fixed’

Couplerconditionspecificationunit and commentsfurther comments Power requirements Operation >400kW for 1600 us Processing >1200kW upto 400 usneed after vac break, cool-down >600kW larger than 400 usneed after vac break, cool-down Processing with reflection mode >600kW for 1600usin Test stand Processing time warm <50hours after installation, definition of power/pulse_width target are the same as 'Power Requirement' above. cold <30hours after installation, definition of power/pulse_width target are the same as 'Power Requirement' above. Heat loads /coupler 2K static < 0.063W 5K static < 0.171Wdepend on tunability 40 K static < 1.79W 2K dynamic < 0.018W 5K dynamic < 0.152W 40K dynamic < 6.93W Cavity vacuum integrety # of windows 2 bias capablity yes RF Properties Qext Yes/Notunabledecide later Tuning range ^6 if tunable Physical envelope Position compatible to TTF-IIIdecide later Flange compatible to TTF-III decide later (to cavity, to cryostat) waveguide compatible to TTF-IIIdecide later support compatible to TTF-IIIdecide later Instrumentation vacuum level >= 1 spark detection 0at window electron current detection >= 1at coax temperature >= 1at window * yellow boxes indicate ‘not fixed’

The next step The tables are to be included into ‘Plug Compatibility Document’. Revision of table contents is by ‘GDE meeting discussion’. Technical Area Group Leaders maintain the contents. (Table in EDMS will be revised.) end.

Nov. 17, 2008ILC-08 SCRF23

24 Two shields model based on TTF-III Study of the “plug-compatible” cryomodule cross-section One shield model to save fabrication cost Nov. 17, 2008 ILC-08 SCRF

Cryomodule V.V. materialCarbon steel Inn. Diameter946.2 mm Slot length12,680 mm Length w/o bellows11,830 mm Coupler pitch mm Cav. Susp. PositionCenter – 24.7 mm Magnetic shieldIn Nov. 17, 2008 ILC-08 SCRF 25

Nov. 17, 2008 ILC-08 SCRF 26

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STF Schedule under Discussion CY STF operation Infrastructure Phase2 3module operation preparation EP Expansion preparation clean room Epanstion preparation 12m module assembly preparation Construct New Adit cryostat test 4-cavity test S1G compleets At end Quantum Beam operation Completes at end Fab. 2 cavities S1 Global Operation Disassy Quantum Beam Assy VT JKT, ASSY Fab 9 cavities VT Fab 17 cavities Quantum Beam Operation (Beam ops w. 2 capture cavs) VT JKT, ASSY Phase2 1module ops Gas Safety App (Cavity) Gas Safety App (cap. Cavities( Gas Safety App (CMs) Modulatoor MBK WG Gas Safety App (Cavity)

How do we discuss the Cavity Plug-compatibility ? Constraint in S1-Global: – S1-Global cryomodule design has already progressed, and in fabrication stage – DESY, Fermilab, KEK cavity design difference has been already absorbed in the S1-global cryomdule design, Discuss “the plug-compatible design” in long- term scope, Nov. 17, 2008ILC-08 SCRF29